根据教程实现了读取csv文件前面的几行数据,一下就想到了是不是可以实现前面几列的数据。经过多番尝试总算试出来了一种方法。
之所以想实现读取前面的几列是因为我手头的一个csv文件恰好有后面几列没有可用数据,但是却一直存在着。原来的数据如下:
GreydeMac-mini:chapter06 greyzhang$ cat data.csv
1,name_01,coment_01,,,, 2,name_02,coment_02,,,, 3,name_03,coment_03,,,, 4,name_04,coment_04,,,, 5,name_05,coment_05,,,, 6,name_06,coment_06,,,, 7,name_07,coment_07,,,, 8,name_08,coment_08,,,, 9,name_09,coment_09,,,, 10,name_10,coment_10,,,, 11,name_11,coment_11,,,, 12,name_12,coment_12,,,, 13,name_13,coment_13,,,, 14,name_14,coment_14,,,, 15,name_15,coment_15,,,, 16,name_16,coment_16,,,, 17,name_17,coment_17,,,, 18,name_18,coment_18,,,, 19,name_19,coment_19,,,, 20,name_20,coment_20,,,, 21,name_21,coment_21,,,,
如果使用pandas读取出全部的数据,打印的时候会出现以下结果:
In [41]: data = pd.read_csv('data.csv')
In [42]: data Out[42]: 1 name_01 coment_01 Unnamed: 3 Unnamed: 4 Unnamed: 5 Unnamed: 6 0 2 name_02 coment_02 NaN NaN NaN NaN 1 3 name_03 coment_03 NaN NaN NaN NaN 2 4 name_04 coment_04 NaN NaN NaN NaN 3 5 name_05 coment_05 NaN NaN NaN NaN 4 6 name_06 coment_06 NaN NaN NaN NaN 5 7 name_07 coment_07 NaN NaN NaN NaN 6 8 name_08 coment_08 NaN NaN NaN NaN 7 9 name_09 coment_09 NaN NaN NaN NaN 8 10 name_10 coment_10 NaN NaN NaN NaN 9 11 name_11 coment_11 NaN NaN NaN NaN 10 12 name_12 coment_12 NaN NaN NaN NaN 11 13 name_13 coment_13 NaN NaN NaN NaN 12 14 name_14 coment_14 NaN NaN NaN NaN 13 15 name_15 coment_15 NaN NaN NaN NaN 14 16 name_16 coment_16 NaN NaN NaN NaN 15 17 name_17 coment_17 NaN NaN NaN NaN 16 18 name_18 coment_18 NaN NaN NaN NaN 17 19 name_19 coment_19 NaN NaN NaN NaN 18 20 name_20 coment_20 NaN NaN NaN NaN 19 21 name_21 coment_21 NaN NaN NaN NaN
所说在学习的过程中这并不会给我带来什么障碍,但是在命令行终端界面呆久了总喜欢稍微清爽一点的风格。使用read_csv的参数usecols能够在一定程度上减少这种混乱感。
In [45]: data = pd.read_csv('data.csv',usecols=[0,1,2,3])
In [46]: data Out[46]: 1 name_01 coment_01 Unnamed: 3 0 2 name_02 coment_02 NaN 1 3 name_03 coment_03 NaN 2 4 name_04 coment_04 NaN 3 5 name_05 coment_05 NaN 4 6 name_06 coment_06 NaN 5 7 name_07 coment_07 NaN 6 8 name_08 coment_08 NaN 7 9 name_09 coment_09 NaN 8 10 name_10 coment_10 NaN 9 11 name_11 coment_11 NaN 10 12 name_12 coment_12 NaN 11 13 name_13 coment_13 NaN 12 14 name_14 coment_14 NaN 13 15 name_15 coment_15 NaN 14 16 name_16 coment_16 NaN 15 17 name_17 coment_17 NaN 16 18 name_18 coment_18 NaN 17 19 name_19 coment_19 NaN 18 20 name_20 coment_20 NaN 19 21 name_21 coment_21 NaN
为了能够看到数据的“边界”,读取的时候显示了第一列无效的数据。正常的使用中,或许我们是想连上面结果中最后一列的信息也去掉的,那只需要在参数重去掉最后一列的列号。
In [47]: data = pd.read_csv('data.csv',usecols=[0,1,2])
In [48]: data Out[48]: 1 name_01 coment_01 0 2 name_02 coment_02 1 3 name_03 coment_03 2 4 name_04 coment_04 3 5 name_05 coment_05 4 6 name_06 coment_06 5 7 name_07 coment_07 6 8 name_08 coment_08 7 9 name_09 coment_09 8 10 name_10 coment_10 9 11 name_11 coment_11 10 12 name_12 coment_12 11 13 name_13 coment_13 12 14 name_14 coment_14 13 15 name_15 coment_15 14 16 name_16 coment_16 15 17 name_17 coment_17 16 18 name_18 coment_18 17 19 name_19 coment_19 18 20 name_20 coment_20 19 21 name_21 coment_21
以上这篇使用pandas读取csv文件的指定列方法就是小编分享给大家的全部内容了,希望能给大家一个参考,也希望大家多多支持。
pandas读取csv指定列
稳了!魔兽国服回归的3条重磅消息!官宣时间再确认!
昨天有一位朋友在大神群里分享,自己亚服账号被封号之后居然弹出了国服的封号信息对话框。
这里面让他访问的是一个国服的战网网址,com.cn和后面的zh都非常明白地表明这就是国服战网。
而他在复制这个网址并且进行登录之后,确实是网易的网址,也就是我们熟悉的停服之后国服发布的暴雪游戏产品运营到期开放退款的说明。这是一件比较奇怪的事情,因为以前都没有出现这样的情况,现在突然提示跳转到国服战网的网址,是不是说明了简体中文客户端已经开始进行更新了呢?
更新动态
- 凤飞飞《我们的主题曲》飞跃制作[正版原抓WAV+CUE]
- 刘嘉亮《亮情歌2》[WAV+CUE][1G]
- 红馆40·谭咏麟《歌者恋歌浓情30年演唱会》3CD[低速原抓WAV+CUE][1.8G]
- 刘纬武《睡眠宝宝竖琴童谣 吉卜力工作室 白噪音安抚》[320K/MP3][193.25MB]
- 【轻音乐】曼托凡尼乐团《精选辑》2CD.1998[FLAC+CUE整轨]
- 邝美云《心中有爱》1989年香港DMIJP版1MTO东芝首版[WAV+CUE]
- 群星《情叹-发烧女声DSD》天籁女声发烧碟[WAV+CUE]
- 刘纬武《睡眠宝宝竖琴童谣 吉卜力工作室 白噪音安抚》[FLAC/分轨][748.03MB]
- 理想混蛋《Origin Sessions》[320K/MP3][37.47MB]
- 公馆青少年《我其实一点都不酷》[320K/MP3][78.78MB]
- 群星《情叹-发烧男声DSD》最值得珍藏的完美男声[WAV+CUE]
- 群星《国韵飘香·贵妃醉酒HQCD黑胶王》2CD[WAV]
- 卫兰《DAUGHTER》【低速原抓WAV+CUE】
- 公馆青少年《我其实一点都不酷》[FLAC/分轨][398.22MB]
- ZWEI《迟暮的花 (Explicit)》[320K/MP3][57.16MB]